I have found this to be an issues when the commander changes, if we are playing bravo and change commander it tends to shift back to alpha after the first game. Never seen it go from alpha to bravo though.

I wish Harekaze without camo was in the shop.
But the collab with HSF was ended a few months ago so the only chance of a reccurance is if they establish a new agreement. And considering the real life difficulties the owners and creators of HSF are having that might not be very likely.

Any changes to the premiums available in the store, or advance information regarding such changes, will be posted on the home page for the public and not in a forum thread for the benefit of a select few or a specific individual.

I have made some changes in an attempt to clarify this particular information on the wiki pages refered to above.
http://wiki.wargaming.net/en/Ship:Armor_thresholds
http://wiki.wargaming.net/en/Ship:Gunnery_%26_Armor_Penetration

You've posted a whole bunch of different numbers there, but the discount is still the 20% off the value of the bundle contents.
9,000 dubloons and 9m credits (which is a dubloon cost of 6,000 dubloons) has a total value of 15,000 dubloons.
15,000 dubloons costs, in GBP, £44.52
but the bundle, which has a value of £44.52 is -20% off, so is only £35.50.
It is entirely possible that the contents have changed, but I'm not sure who else is watching these store bundles closely enough to know that.
https://worldofwarships.eu/en/news/sales-and-deals/premium-shop-december-2018/ this page also links the bundle as it is displayed right now.
All I can say is that the bundle definitely does save you 20%.

Well, they were just for black friday sale, and to be honest they were relatively cheap. If they had been a permacamo for Tirpitz you would have had to already owned Tirpitz to use it, and for Bismarck it would not be much of a sale item as it'd likely be another 1k dub camo, identical is all but looks to Bismarcks existing permacamo.
The B ships are cheaper alternatives and their only downside was no fancy camos, unless you like the black style.